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i have a 98 e36 318ti now with almost 300 000km heres the problem when i acclerate the car like jerks sometimes, pulls then not and when its not pullin (keep in mind my foot is down on the pedal the entire time) it makes a little poppin sound fromt the exhaust, now i figure either i am haveing a ignition problem like no spark or i am haveing a fuel problem or both, this problem NEVER occurs during a consistan rpm or when decellerating (oh and sometimes the car will just turn off) any ideas suggestions, has this happened to anyone be4 and could it be the csps(camshaft positioning sensour)?

spark plugs: check the color of the plugs, should be light brown and dry
Air Filter: dirty, not properly mounted etc.
Air Leak: the rubber boots in your intake tract can crack
Ingition coils/wires: not sure how to properly check those
O2 sensor: not sure how to check it either, i think it should throw and engine code when it gets real bad, but mine didnt trip and replacing it fixed the problem

if you havent changed plugs in a while and ther air filter you might as well just give her a tune-up and not even guess about the state of the current ones.

^^ what he said, buy the OEM replacements, and have your coils checked out, you can do that with a simple ohm meter, chances are you are getting voltage to your ocils, but make sure they are a stable voltage, and check out some DIY sites to check the coils to see if they are in proper working order

As for alex dee's question, they might not crap out all at once, if 1 takes a poop, you only have 5 cylinders working, and that definately sucks, that also makes the other coils have to work that much harder because of 1 lagged cylinder, so in turn they go and take a poop too, slowly, but surely...

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1995 325i- slushbox, cause i like it that way...
Soon2B- ??? - manual/stick cause i like it that way ?

The light used to come on and stay on, then it was every now and then, and now it rarely comes on at all. The first time I noticed the check engine light on, the whole car started rumbling like there was an exhaust manifold leak or something. It was really loud too. But that went away on its own, Thank God.

How much did it cost you to replace the crankshaft positioning sensor? Was it an easy fix? I'm thinking its either the coil pack, spark plugs, or some sensor. Can't be the air filter or fuel filter, I changed that recently.
A couple years ago when I had problems like this it turned out to be the o2 sensor.